How to get the last five characters of a string using Substring in C

Question

I can get the first three characters with the function below     However  how can I get the output of the last five characters   Three   with the Substring   function  Or will another string function have to be used   static void Main         string input    OneTwoThree           Get first three characters     string sub   input Substring 0  3       Console WriteLine  Substring   0    sub      Output One

User · Answer

One way is to use the Length property of the string as part of the input to Substring   string sub   input Substring input Length - 5      Retrieves the last 5 characters of input

User · Answer

e g  string str   null  string retString   null  str    quot This is substring test quot   retString   str Substring 8  9    This return  quot substring quot  C  substring sample source

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string sub   input Substring input Length - 5

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In C  8 0 and later you can use   5    to get the last five characters combined with a   operator to avoid a potential ArgumentOutOfRangeException  string input1    quot 0123456789 quot   string input2    quot 0123 quot   Console WriteLine input1 Length  gt   5   input1  5      input1     returns 56789 Console WriteLine input2 Length  gt   5   input2  5      input2     returns 0123  index-from-end-operator and range-operator

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Get first three characters string sub   input Substring 0  3   Console WriteLine  Substring   0    sub      Output One    string sub   input Substring 6  5   Console WriteLine  Substring   0    sub     You ll get output  Three

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static void Main                 string input    OneTwoThree                  Get last 5 characters         string sub   input Substring 6           Console WriteLine  Substring   0    sub      Output Three            Substring 0  3  - Returns substring of first 3 chars    One Substring 3  3  - Returns substring of second 3 chars    Two Substring 6  - Returns substring of all chars after first 6    Three

User · Answer

string input    OneTwoThree    if input length  gt 5    string str input substring input length-5 5

User · Answer

simple way to do this in one line of code would be this  string sub   input Substring input Length  gt  5   input Length - 5   0     and here some informations about Operator

User · Answer

If your input string could be less than five characters long then you should be aware that string Substring will throw an ArgumentOutOfRangeException if the startIndex argument is negative   To solve this potential problem you can use the following code   string sub   input Substring Math Max 0  input Length - 5      Or more explicitly   public static string Right string input  int length        if  length  gt   input Length                return input            else               return input Substring input Length - length

User · Answer

If you can use extension methods  this will do it in a safe way regardless of string length   public static string Right this string text  int maxLength        if  string IsNullOrEmpty text     maxLength  lt   0                return string Empty             if  maxLength  lt  text Length                return text Substring text Length - maxLength              return text      And to use it   string sub   input Right 5

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Substring  This method extracts strings  It requires the location of the substring  a start index  a length   It then returns a new string with the characters in that range   See a small example     string input    OneTwoThree      Get first three characters  string sub   input Substring 0  3   Console WriteLine  Substring   0    sub     Output    Substring  One

User · Answer

Here is a quick extension method you can use that mimics PHP syntax  Include AssemblyName Extensions to the code file you are using the extension in    Then you could call   input SubstringReverse -5  and it will return  Three    namespace AssemblyName Extensions        public static class StringExtensions                    lt summary gt              Takes a negative integer - counts back from the end of the string               lt  summary gt               lt param name  str  gt  lt  param gt               lt param name  length  gt  lt  param gt          public static string SubstringReverse this string str  int length                        if  length  gt  0                                 throw new ArgumentOutOfRangeException  Length must be less than zero                                if  str Length  lt  Math Abs length                                 throw new ArgumentOutOfRangeException  Length cannot be greater than the length of the string                                return str Substring  str Length   length   Math Abs length

[c#] How to get the last five characters of a string using Substring() in C#?

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